Husqvarna 343F, 345FX, 345FXT, 343R, 345RX manual Fuel pump, Carburettor, Dismantling

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3

Fuel system

Clean the filter externally if it is not too dirty.

Replace the filter if required.

Fuel pump

The fuel pump facilitates cold starts.

The pump cannot be repaired and must be replaced if it stops working.

Note how the fuel hoses are connected to simplify assembly.

Carburettor

Dismantling

Blow clean the carburettor compartment.

Loosen the bolts (A) and remove the nuts (B).

Remove the fuel hose (C) and fold the filter holder aside.

If the filter is not too dirty, its surface can be cleaned with a brush.

Otherwise it must be replaced.

Check the fuel hose for cracks and leaks.

Make sure that the filter’s connection neck is inserted as far as possible into the fuel hose and that the O-ring is sufficiently tight so that the filter cannot slide off the tube.

Fuel pump

The fuel pump has the task of facilitat- ing the start of the engine when cold. The pump fills the carburettor with fuel before attempting to start the engine. This also prevents vapour bubbles from blocking the narrow fuel channels.

If the pump does not work it must be replaced.

Note how the fuel hoses are connected to simplify assembly.

Carburettor

Dismantling

1.Remove the carburettor cover and blow the carburettor compartment clean with compressed air.

2.Loosen the bolts (A).

3.Remove the nuts (B).

4.Remove the fuel hose (C) from the carburettor and the filter holder.

18

505 38 13-08

 

502 50 18-01

 

 

Move the fuel tank so far forward that

5.

Move the fuel tank so far forward

the fuel hoses (C) and (D) can be

 

that the fuel hose (C) becomes

removed.

 

 

 

accessible.

 

 

 

 

Move the O-ring back and remove

 

 

 

 

the hose from the nipple.

 

 

 

 

Also remove the fuel hose (D) from

 

 

 

 

the nipple on the tank.

 

 

 

 

 

 

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Contents English Workshop Manual Brushcutter, Trimmer Model 343R, 345RX, 343F, 345FX, 345FXT ContentsGeneral recommendations Starter ContentsDismantling 1StarterStarter AssemblyReplacing the drive dogs Electrical system Checking the ignition spark Electrical system502 71 Tip 502 50 Replacing the spark Plug cover502 54 Heated handles Drive dogsWiring diagram Electrical system Fuel system Air filter Fuel systemFuel filter Tank ventingCarburettor Fuel pumpDismantling Metering unit Carburettor’s designBlending unit Dismantling the carburettor Pump unitFuel system For example, the H-needle is a PositionedLittle shorter than the L-needle Assembling the carburettor Are not bent or pinched when H-needle is a little shorterThan the L-needle Check carefully that the fuel hosesBasic setting Carburettor settingsFine adjustment Idling speed T-screw Setting Recommended max. speed must not be exceededCorrectly adjusted carburettor Tachometer should always be used to find the optimalRotating Carburettor adjustment 345RX/FXAdjusting the L-needle Adjusting the H-needle ThrottleCheck for wear on pins a and B Tip Page Centrifugal clutch 502 21 Centrifugal clutchDo not lose the sleeve bearings found in the clutch shoes Centrifugal clutch502 11 Clutch drumChange the bearings in the clutch housing if necessary Page Angle gear Let the small circlip around the axle remain Angle gearInput axle with pinion must be dismantled first 503 97503 80 ShaftCylinder and piston Cylinder and piston When the valve is fitted the small hole must face outwards Turn the valve the right way when fittingDecompression valve Inlet manifold Cleaning, inspectionInsufficient lubrication Analysis and actionsCause Action Piston scoring caused by heavy carbon deposits Piston ring breakage Piston damage caused by a too high engine speedCause Foreign objectsDefect Action Service tipsWear tolerances Crankshaft and crankcase Crankshaft and crankcase 502 52 Crankshaft and crankcaseInspecting Crankshaft Assembly To ensure a proper seal Leakage testing CrankcasePress down the sealing plates as Far as possible between the bolts503 55 Husqvarna E-Tech
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